Venetian blinds



June 5, 1956 B. AKERsTRM 2343552 VENETIAN BLINDs Filed Dec. 9, 1953 2 Sheets-Sheet 1 FIG.2

ATTORHEYS June 5, 1956 B. KERsTRM 2,748,852

VENETIAN BLINDS Filed-Dec. 9, 1953 2 Sheets-Shet 2 A'TTORA/EYS United States Patent O VENETIAN BLINDs Brje kerstrm, Nasbypark, Sweden, assignor to Aktiebolaget Atvidabergs Butiksinredningar, Stockholm, Sweden, a joint-stock company of Sweden Application December 9, 1953, Serial No. 397,074

Claims priority, application Sweden January 26, 1953 1 Claim. (Cl. 160-168) The present invention relates to an arrangement in Venetian blinds of the kind which at the top and the bottom, has cross-bars connected by means of ladder tapes for slats which by means of cords can be adjusted in different angular positions, and which also has hoisting cords' fastened to the lower cross-bar and running through holes in the upper cross-bar over stationary pulleys arranged at the end portions of said upper cross-bar, so that the blind can be adjusted on different levels. Blinds of this kind have the drawback that the adjustment of the level of the blind and of the angle of the slats is carried out by means of different cords. This drawback is eliminated by this invention which is substantially characterised in that the hoisting cord which is manually actuated at one end, is divided at the other end into two parts, which run over the pulley located furthest away from the entry of the hoist cord to the cross-bar, and over the runner in a block arranged close to the second pulley, from where the said parts are stretched back towards the former pulley and run through holes to the lower cross-bar, and in that two cords for the adjustment of the angle of the slats are fastened to the housing of the block, each cord running over the second pulley and through a hole in the top cross-bar. Each of the said cords is connected with the upper portion of the Vertical stretches of the ladder tapes located at one side of the slats. The upper portion of the opposite Vertical stretches of the ladder tapes may be r'igidly connected to the upper cross-bar. The pulleys and the block may be placed in a channel provided in the upper cross-bar.

An embodiment of the invention is shown in the accompanying drawing in which Figure 1 shows the upper cross-bar with the different devices in the position When the blind is raised,

Figure 2 in the position when the blind is lowered.

Figure 3 is a Vertical section along the line III-III in Figure 1, and

Figure 4 is a Vertical section along the line IV-IV in Figure 2.

Referring now to the drawing 2 designates the upper cross-bar and 3 the lower cross-bar between which the slats 4 supported by ladder tapes are arranged. In the upper cross-bar an upwardly directed open channel 5 is provided, at both ends of which pulleys 7 and 8 are mounted on Vertical shafts 6. Directly above the two ladder tapes are arranged fitted-in, horizontal shafts 9, a pulley 10 being mounted on each of these shafts in a recess 11 in the cross-bar. The hoisting cord 12, which can be actuated manually at one end, is' at its other end divided into two parts 13 and 13a, which run over the pulley 7 which is located further away from the entry of the cord to the cross-bar and over the runner 14 in a 2,748,852 Patented June 5, 1956 ICC block 15 close to the other pulley 8. From here the two parts run, one over the nearer of the pulleys 10 and the other one over both pulleys 10 down through the respective recesses 11 and through holes in the slats to the lower cross-bar 3 to which the parts are fastened. In the block 15 are fastened two cords 16 and 16a for the adjustment of the angle of the slats, which cords run over the pulley 8, Whereafter one of them passes over the nearer shaft 9 down through a slot 11a in the cross-bar 2 below the shaft, and the other one pass'es over both shafts 9 down through a second slot 11a below the other shaft, after which each of both cords are attached to the upper portion of a ladder tape Vertical 17 arranged on the side of the slats. The ladder tape verticals 18 on the other side of the slats are fastened to the upper cross-bar at 19, so that, when the blind is entirely lowered the latter verticals 18 are straight, stretched by the lower cross-bar 3.

The device functions as follows:

If the blind is entirely lowered, the ladder tape Vertical 18 hangs substantially vertically and the lower cross-bar is swung downwards, whereby the ladder tape verticals 17, which are fastened to the other end of the lower cross-bar, are carried downwards, and the slats' will assume a position which is nearly Vertical, as can be seen from Figure 4. If the blind is to be raised, the hoisting cord 12 is pulled, whereby the upper unparted end 12a of said cord is moved to the left, as shown in Figure 2, carrying the block 15 to the position shown in Figure 1, the cords 16 and 16a for the adjustrnent of the angle of the slats being stretched, so that they raise the verticals 17, whereby the slats assume for example horizontal position. When the pulling at the hoisting cord 12 is continued, the parts 13 and 13a lift the lower cross-bar upwards with the slats in oblique position, until the blind assumes the position shown in Figure 3.

The invention is not restricted to the embodiment shown, but may be varied within the scope of the invention.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is:

In a Venetian blind having a top crossbar and a bottom crossbar connected by ladder tapes and cords for adjusting the blind to different levels which cords are fixed to the lower crossbar and eXtend through holes in the upper crossbar and over pulleys adjacent the ends of that bar, in combination, a sheave through which the adjusting cords pass, means uniting said cords beyond said sheave, the single resulting cord then extending into a position to be manually operated, a pair of cords for tipping the blind slats, each said cord being fixed to a corresponding end of one of the ladder tapes at the top thereof, both cords of said pair being fiXed to said sheave, and means' for guiding said adjusting and tipping cords to exert tension on said sheave to cause movement thereof in opposite directions longitudinally of the upper crossbar, whereby initial movement of said single adjusting cord in a direction to raise said blind causes movement of said sheave to adjust the slats and movement of said single cord after the slats have become parallel to the crossbars causes movement of the two ends of said single cord through said sheave to raise the blind.

References Cited in the file of this patent UNITED STATES PATENTS 

